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Effect of Post Consumer Recyclate on SMA Copolymer Boss/Joint Performance
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English
Abstract
The use of Post Consumer Recyclate (PCR) or Post Industrial Regrind (PIR) to manufacture thermoplastic (or thermoset) automotive parts and components has significantly increased over the last 10 years. Due to this increase in use, automotive designers are continuously challenged with the question of how PCR or PIR material differ in performance from the virgin material? To compound the dilemma, automotive OEMs are requiring increased durability of thermoplastic attachments (joints), so that warranty costs associated with interior squeak and rattle (from ill-fitting joints) are minimized. To answer this question, there exist several techniques for finding thermoplastic joint durability performance. Some of them are: strip-to-drive torque ratios, screw pull-off force and clamp load fall-off. A thermoplastic attachment (i.e. boss) which experiences clamp load fall-off will lead to a loose fitting joint and subsequently result in squeaks and rattles. Also, if a boss has a low strip-to-drive ratio (≤ 3:1), there is a potential for assembly and/or field failure. This paper addresses the changes in drive-to-strip, clamp load and hoop stress that are experienced when virgin versus recycled content containing bosses are evaluated for their joint performance.
Authors
Citation
Bartos, C., Dapoz, A., Rozmus, R., and Trapp, M., "Effect of Post Consumer Recyclate on SMA Copolymer Boss/Joint Performance," SAE Technical Paper 960698, 1996, https://doi.org/10.4271/960698.Also In
References
- Hoy, R. Bartos C. Leung R. Rozmus R. Trapp M. “Determination of Dimensional Changes in Injection Molded Bosses Using Strain Gages: Effects on Joint Durability” SAE Paper # 940653 1994
- Bartos, C. Leung R. Rozmus R. Trapp M. Hoy R. “Effect of Regrind on SMA Copolymer Bosses/Joint Performance” SAE Paper # 950810 1995
- Bartos, C. Leung R. Rozmus R. Trapp M. “Clamp Load and Strip-to-Drive Performance Measurements for Thermoplastic Bosses: Design of a Robust Joint” International Body Engineering Conference, Advanced Technologies & Processes 9 135 1995
- Hill, W. “Evaluating Boss Designs for Thermoset Glass-Filled Polyesters” Plastic Engineering 29 January 1996